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From "Mike Klaas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1293) Tweaks to PhraseQuery.explain()
Date Fri, 30 May 2008 00:07:45 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12600973#action_12600973
] 

Mike Klaas commented on LUCENE-1293:
------------------------------------

It is meant for debugging, though I have found it so painfully slow in the past that I have
avoided it on occasion.

The main culprit is the looped next() call in PhraseScorer.explain().  Using skipTo() would
be faster.

> Tweaks to PhraseQuery.explain()
> -------------------------------
>
>                 Key: LUCENE-1293
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1293
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>    Affects Versions: 1.9, 2.0.0, 2.1, 2.2, 2.3, 2.3.1, 2.3.2, 2.4
>            Reporter: Itamar Syn-Hershko
>            Priority: Minor
>             Fix For: 2.4
>
>
> The explain() function in PhraseQuery.java is very clumzy and could use many optimizations.
Perhaps it is only because it is intended to use while debugging?
> Here's an example:
> {noformat}
>       result.addDetail(fieldExpl);
>       // combine them
>       result.setValue(queryExpl.getValue() * fieldExpl.getValue());
>       if (queryExpl.getValue() == 1.0f)
>         return fieldExpl;
>       return result;
>    }
> {noformat}
> Can easily be tweaked and become:
> {noformat}
>       if (queryExpl.getValue() == 1.0f) {
>         return fieldExpl;
>       }
>       result.addDetail(fieldExpl);
>       // combine them
>       result.setValue(queryExpl.getValue() * fieldExpl.getValue());
>       return result;
>   }
> {noformat}
> And thats really just for a start...
> Itamar.

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